Finding the Fourth Proportional to 1,355.07, 1,868.34 and 1,144.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.07 : 1,868.34 = 1,144.89 : x
2. Step 2: Convert to fraction form
   1,355.07/1,868.34 = 1,144.89/x
3. Step 3: Cross multiply
   1,355.07x = 1,868.34 × 1,144.89
4. Step 4: Simplify right side
   1,355.07x = 2,139,043.78
5. Step 5: Solve for x
   x = 2,139,043.78/1,355.07
6. Step 6: Final answer
   x = 1,578.55